refactor(activity-meter): redesign screen with honest per-range stats

apps/mobile_app/lib/core/init_app.dart

@@ -3,6 +3,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:intl/date_symbol_data_local.dart';
 import 'package:design_system/design_system.dart';
 import 'package:sca_treezor/sca_treezor.dart';
 import 'package:sf_app_platform/config/env/environment_enum.dart';
@@ -19,14 +20,12 @@ import 'package:sf_tracking/sf_tracking.dart';
 Future<void> initApp(EnvironmentEnum env) async {
   WidgetsFlutterBinding.ensureInitialized();
   await SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
+  await initializeDateFormatting();
 
   navigationModule();
   scaTreezorModule();
   themePackages();
 
-  // Order matters: Firebase → sfTracking (FirebaseTrackingClient touches
-  // FirebaseAnalytics.instance) → router (SaveFamilyApp wires sfTracking
-  // into SfRouterListener at construction time).
   await setupFirebase(env);
   await setupNotifications();
   initSfTracking();

apps/mobile_app/pubspec.yaml

@@ -94,6 +94,7 @@ dependencies:
   #dependencies go here
   cupertino_icons: ^1.0.8
   flutter_svg: ^2.2.2
+  intl: ^0.20.2
   go_router_builder: ^4.1.1
   build_runner: ^2.7.1